Question pc won't boot up after i disconected and reconected

Jan 15, 2021
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hey all! So my pc has 2 hard drives. and which have windows 7, 10 on them. Recently i disconected the one with windows 10 and reconnected it back in. But then bios didn't detect any boot drives not even the one with windows 7. And i didnt even touch it. Please help

-andy